Windows 7 How to change default XML editor?

I am trying to make it so if you right click on an XML document and click EDIT that NOTEPAD is not the program that opens but a differently installed program. I have figured out how to change how EDIT responds on TXT files, but can't figure it out with XML files. I have also considered that the drop down box in Internet Explorer on the default editor might be the trick, but the only option is NOTEPAD. So if I can figure out how to change the entries in the list then maybe that would be the fix, otherwise I'm sure it will be a registry fix.

Thanks, George Jackson